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3.5x+x=90
We simplify the equation to the form, which is simple to understand
3.5x+x=90
We move all terms containing x to the left and all other terms to the right.
+3.5x+1x=+90
We simplify left and right side of the equation.
+4.5x=+90
We divide both sides of the equation by 4.5 to get x.
x=20
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